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WO1988003991A1 - Commande d'alternateur pour bougie de prechauffage - Google Patents

Commande d'alternateur pour bougie de prechauffage Download PDF

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Publication number
WO1988003991A1
WO1988003991A1 PCT/US1987/002878 US8702878W WO8803991A1 WO 1988003991 A1 WO1988003991 A1 WO 1988003991A1 US 8702878 W US8702878 W US 8702878W WO 8803991 A1 WO8803991 A1 WO 8803991A1
Authority
WO
WIPO (PCT)
Prior art keywords
resistance
signal
glow plug
voltage
preselected
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US1987/002878
Other languages
English (en)
Inventor
James R. Jeffries
Michael R. Verheyen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Caterpillar Inc
Original Assignee
Caterpillar Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Caterpillar Inc filed Critical Caterpillar Inc
Priority to BR8707552A priority Critical patent/BR8707552A/pt
Publication of WO1988003991A1 publication Critical patent/WO1988003991A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
    • F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs
    • F02P19/025—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs with means for determining glow plug temperature or glow plug resistance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
    • F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs
    • F02P19/021—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs characterised by power delivery controls
    • F02P19/023—Individual control of the glow plugs

Definitions

  • This invention relates generally to an apparatus for controlling igniting devices of an internal combustion engine and more particularly to an apparatus for continually regulating the resistance of glow plugs over the temperature range of an operating engine.
  • Glow plugs assist combustion in alcohol fueled engines. Unfortunately, energizing a glow plug in the continuously changing temperature of an operating engine poses additional problems. Glow plugs are utilized primarily for starting engines and can be damaged quite easily if used over longer periods of time.
  • each glow plug requires a separate control to step down the vehicle electrical system voltage to levels which provide satisfactory fuel combustion and adequate glow plug life.
  • a control scheme of this type wastes money and is unnecessarily complex. For example, a six cylinder engine requires six controls.
  • the present invention is directed to overcoming one or more of the problems as set forth abov .
  • an apparatus controls the resistance of a glow plug over various operating temperature ranges of an internal combustion engine.
  • the apparatus is electrically powered by a first alternator.
  • a means produces a resistance error signal in response to the glow plug's resistance differing from a preselected glow plug resistance.
  • a second alternator means delivers a voltage signal to the glow plug to control the glow plug's resistance relative to the preselected resistance in response to receiving the resistance error signal.
  • an apparatus controls the resistance of a glow plug over various operating temperature ranges of an internal combustion engine.
  • the apparatus is electrically powered by a first alternator.
  • a means produces a resistance error signal in response to a glow plug's resistance differing from a preselected glow plug resistance.
  • a second alternator means delivers a voltage signal to the glow plug to control the glow plug's resistance relative to the preselected resistance in response to receiving the resistance error signal.
  • an apparatus controls the resistance of a glow plug over various operating temperatures in an engine.
  • the resistance of the glow plug is determined and compared to a preselected glow plug resistance.
  • a resistance error signal is. -.._-__; delivered in response to a difference between the compared signals.
  • the resistance error signal is received by a circuit which delivers a signal to the glow plug to control its resistance relative to the preselected glow plug resistance.
  • an apparatus controls the resistance of a plurality of glow plugs over various operating temperatures in an engine.
  • the current through one of the glow plugs is sensed and a signal relative to the magnitude of the sensed current is delivered.
  • the voltage across the glow plug is sensed and a signal relative to the magnitude of the sensed voltage is delivered.
  • the sensed voltage signal is divided by the sensed current signal to obtain a glow plug resistance, and a signal relative to the magnitude of the obtained resistance is delivered.
  • a signal relative to the magnitude of a preselected glow plug resistance is compared to the obtained resistance signal, and a resistance error signal is delivered in response to a difference between the compared resistance signals.
  • the resistance error signal is received, and an alternator input signal is delivered in response to the resistance error signal.
  • a resistance controlling signal is delivered to the plurality of glow plugs in response to the alternator input signal.
  • the resistance of the plurality of glow plugs is controlled relative to the preselected resistance.
  • Alternate fuels such as alcohol
  • additional heat must be supplied, usually from the glow plugs already present in the engine.
  • glow plugs are not designed for prolonged use, they typically fail within a short period of time.
  • Precision voltage controls attempt to regulate the glow plugs during operation to lengthen their usable lives. As the engine operates and its temperature changes, the voltage controls tend to overdrive the glow plugs and the glow plugs overheat. Therefore, while these controls do prolong glow plug life, additional operating life can still be coaxed from a glow plug.
  • the present invention regulates the glow plug power output in response to temperature changes in the cylinders of the engine. It has been observed that glow plug temperature varies with glow plug resistance. Therefore, glow plug resistance is monitored as an indication of temperature. By controlling the resistance of the glow plugs, their functioning temperature is controlled. Longer life results in response the glow plugs being protected from overheating.
  • Another advantage of the present invention is the reduction of complexity and cost.
  • the present invention monitors one glow plug and controls all of them.
  • the apparatus monitors only one glow plug, since there is little variation between glow plug parameters in an operating engine. This scheme eliminates the waste of duplicate controls for each glow plug.
  • Fig. 1 illustrates the connection of the present invention to a typical vehicle electrical system
  • Fig. 2 illustrates a functional block ..: __ diagram- of a preferred embodiment of the present invention
  • Fig. 3 illustrates.a functional block _ diagram of the preferred embodiment of the present invention coupled with a constant voltage control for glow plugs;
  • Fig. 4 illustrates a schematic of the preferred embodiment of Fig. 3;
  • Fig. 5 is a functional block diagram of an alternate embodiment of the present invention
  • Fig. 6 is a schematic diagram of the embodiment of Fig. 5.
  • Fig. 1 illustrates the system connection scheme of the glow plug alternator control apparatus 20.
  • Power is provided to the apparatus 20 from a first alternator, the system alternator 22.
  • the apparatus 20 senses the voltage and current through the glow plug 28 of the engine 24.
  • the apparatus 20 determines the resistance of the glow plug 28 and compares it to a preselected resistance.
  • a resistance error signal is delivered in response to a difference between the compared signals.
  • a second alternator 26 is responsive to the resistance error signal and delivers a voltage signal to the glow plug 28 to control its resistance to the preselected resistance value.
  • the glow plugs 30,32,34,36,38 are connected in parallel with the glow plug 28, all of the glow plugs 30,32,34,36,38 are controlled to the preselected resistance.
  • a means 21 determines the resistance of a glow plug 28 in the following manner.
  • a current sensor 40 senses the glow plug 28 current and delivers a signal relative to the magnitude of the sensed current.
  • a voltage sensor 44 senses the glow plug 28 voltage and delivers a signal relative to the magnitude of the sensed voltage. These two signals are input to a divider means 46, where the sensed voltage signal is divided by the sensed current signal and a glow plug resistance is obtained.
  • the means 21 also delivers a resistance error signal in the following manner.
  • a comparator 48 receives the obtained resistance signal and compares it to a preselected resistance signal delivered by a signal delivering means 50.
  • the comparator 48 delivers a resistance error signal in response to a difference between the obtained resistance signal and the preselected resistance signal.
  • An output means 52 receives the resistance error signal and delivers an alternator input signal in response thereto.
  • the second alternator means 26 is responsive to the input signal.
  • the second alternator means 26 delivers a resistance controlling signal to the plurality of glow plugs. The signal controls the resistance of each glow plug relative to the preselected glow plug resistance.
  • the voltage and current of one of a plurality of glow plugs is monitored.
  • the voltage is divided by the current to obtain an indication of the glow plug's resistance.
  • This value is compared with a preselected glow plug resistance, that is the desirable resistance of the glow plug. If the obtained resistance differs from the preselected resistance, the glow plug resistance is increased or decreased until it substantially equals the preselected resistance.
  • glow plug resistance is related to glow plug temperature. An operating engine cycles through a range of temperatures, so the temperature of the glow plugs changes.
  • the apparatus .20.continuously ._ monitors the resistance of a glow plug and controls the resistance of the plurality of glow plugs to protect them from overheating. Due to this substantially continuous resistance feedback, the glow plug resistance is prevented from drifting undesirably from the preselected resistance.
  • the resistance control range is plus or minus five percent of said preselected glow plug resistance signal value.
  • FIG. 3 illustrates a block diagram of the constant resistance control of Fig. 2, coupled with a constant voltage control. This type of control is desirable in the event of a glow plug failure. Should the monitored glow plug open-circuit, the control switches to a constant voltage type control until the failed glow plug is replaced.
  • Fig. 4 depicts a detailed embodiment of the apparatus 20 of this invention.
  • a current sensor 40 senses the glow plug 28 current.
  • a means 60 converts the sensed current to a voltage and delivers a signal relative to the magnitude of the sensed current.
  • a current mirror circuit 62 accomplishes these tasks.
  • a voltage sensor 44 senses the glow plug 28 voltage and delivers a signal relative to the magnitude of the sensed voltage.
  • the voltage sensor 44 is shown to be a simple buffered voltage divider circuit 64. The two signals are input to a divider means 46, such as the "AD538" 47 manufactured by Analog Devices of Norwood, Massachusetts. Here the sensed voltage signal is divided by the sensed current signal to obtain a glow plug resistance.
  • a comparator 48 compares the obtained resistance signal to a preselected resistance signal delivered by a signal delivering means 50, such as a potentiometer 65. The comparator 48 delivers a resistance error signal in response to the obtained glow plug resistance signal being less than the preselected glow plug resistance signal.
  • a comparator 66 compares the sensed glow plug voltage signal to a preselected voltage signal delivered by a signal delivering means 68, also shown to be a potentiometer 67. The comparator 66 delivers a voltage error signal in response to a difference between the sensed and the preselected glow plug voltages. The comparator 66 delivers a voltage error signal in response to the sensed glow plug voltage being less than the preselected glow plug voltage.
  • the resistance comparator 48 and the voltage comparator 66 are operational amplifiers 70, 80 with stability provided by respective feedback resistors 74, 83, as shown in Fig. 4.
  • the operational amplifier 70 receives the preselected resistance signal from the potentiometer 65 via a resistor 106 and the obtained glow plug resistance from the divider 47 via a resistor 108.
  • the operational amplifier 80 receives the preselected voltage signal from the potentiometer 67 via a resistor 110 and the sensed glow plug voltage signal from the buffered voltage divider circuit 64 via a resistor 112.
  • a detection circuit determines if a glow plug is open-circuited.
  • a signal delivering means 78 such as an operational amplifier 100, delivers a preselected threshold resistance signal which is relative to the magnitude of a resistance value in the range of less than that of an open-circuited glow plug and greater than the preselected glow plug resistance.
  • an operational amplifier 72 is used as a comparator 81, which is shown in Fig. 3. This operational amplifier 72 receives the threshold resistance signal from the operational amplifier 100 via a resistor 102 and the glow plug resistance signal from the divider 47 via a resistor 104. The operational amplifier 72 delivers a 'high' voltage signal in response to the obtained glow plug resistance signal being greater than the preselected threshold resistance signal.
  • a logic means 82 selects one of the resistance error signal and the voltage error signal in response to the obtained glow plug resistance being respectively less than and greater than the preselected threshold resistance signal, and delivers the selected signal.
  • an •AND' gate 84 receives the outputs of the glow plug voltage comparator 66 and the threshold resistance comparator 81. When the glow plug is open-circuited, the 'AND' gate 84 is enabled to deliver the voltage error signal. Furthermore, if the glow plug is open-circuited, the output of the resistance comparator 48 is 'low* since the obtained resistance is greater than the preselected resistance.
  • the outputs of the 'AND' gate 84 and of the resistance comparator 48 are input to an 'OR' gate 86.
  • the 'OR' gate 86 delivers a 'high' signal if any of its inputs are 'high'. Therefore, when the glow plug 28 is operational, the 'AND' gate 84 cannot deliver a 'high 1 signal, and the resistance error signal is selected. When the glow plug 28 open-circuits, the resistance comparator 48 cannot deliver a 'high* signal, and the voltage error signal is selected.
  • the logic means 82 also includes a switch 103 for selecting said voltage error signal in response to closure of said switch.
  • the logic means 82 includes amplifiers 90,92 adapted for selecting one of the resistance error signal and the voltage error signal in response to the obtained glow plug resistance being respectively less than and greater than the preselected threshold resistance, and delivering the selected signal.
  • the operational amplifier 90 receives output signals from the operational amplifiers 72, 80 and outputs a 'high' signal only if both signals are 'high* .
  • the output signals from the amplifier 90 and the amplifier 70 are input, using a wired 'OR' connection 94 as is well known in the art, to the amplifier 92.
  • the amplifier 92 outputs a 'high' voltage signal if either of the input signals is 'high'.
  • the function of this logic is to select the resistance error signal, when the glow plug 28 is not open-circuited, and to select the voltage error signal, when the glow plug 28 is open-circuited.
  • An output means 52 receives the selected signal. This signal is converted to a higher powered signal and sent to the input of the alternator means 26.
  • the second alternator 26 receives the input signal.
  • the input signal is pulse width modulated.
  • a 'high' voltage signal results from a resistance or voltage which is less than the respective preselected value
  • a 'low' voltage signal results from a resistance or voltage signal which is equal to or greater than the respective preselected value.
  • the output means 52 is shown in Fig. 4 as a field effect transistor 98 with a pull-up resistor 101 connecting the gate of the transistor 98 to a positive voltage source.
  • the gate of transistor 98 receives the selected signal from the output of the operational amplifier 92.
  • the transistor turns 'on' and conducts current from the positive voltage source through the alternator winding 96 to circuit ground.
  • the gate voltage is zero, the transistor turns 'off* and does not conduct current.
  • Controlling the current in the alternator field winding 96 controls the second alternator's 26 output voltage, which is delivered to the glow plugs 28,30,32,34,36,38. In this way, power is supplied to the alternator field winding for transfer to the plurality of glow plugs 28,30,32,34,36,38 for controlling their resistance and temperature.
  • Figs. 5 and 6 show an alternate preferred embodiment of the apparatus 20.
  • Fig. 5 is a functional block diagram of the alternate embodiment.
  • a current sensor 116 senses current through a glow plug 28 and delivers a signal relative to the magnitude of the sensed current.
  • a means 120 modifies the sensed current signal.
  • the current modifying means 120 effectively multiplies the sensed current signal by a first coefficient to produce a modified current signal, which is correlative to the current through the glow plug 28. This relationship is shown algebraically in eqn. 1.
  • Igp is the sensed current through the glow plug
  • G is the first coefficient
  • Vi is the modified current signal.
  • a voltage sensor 118 senses the voltage across the glow plug 28 and delivers a signal relative to the magnitude of the sensed voltage.
  • a means 122 modifies the sensed voltage signal.
  • the voltage modifying means 122 effectively multiplies the sensed voltage signal by a second coefficient and produces a modified voltage signal, which is correlative to the voltage across the glow plug 28. This relationship is shown algebraically in eqn. 2.
  • Vgp is the sensed voltage across the glow plug
  • H is the second coefficient
  • Vv is the modified voltage signal.
  • the modified voltage and current signals change value. If the modified current signal is forced to equal the modified voltage signal, it follows, by algebraic manipulation, that the quotient of glow plug voltage divided by glow plug current is equal to the quotient of the first coefficient divided by the second coefficient. It further follows that the quotient of glow plug voltage divided by glow plug current is equal to the resistance of the glow plug. Since the quotient of the first and second coefficients does not change, the quotient of the first coefficient divided by the second coefficient equals a preselected glow plug resistance. The preceding explanation is expressed algebraically as follows in eqns. 3.
  • a comparator 124 receives the modified signals.
  • the comparator 124 compares the modified voltage signal with the modified current signal and delivers a resistance error signal in response to a difference between the compared signals. Theoretically, if the modified signals are equal, then the sensed resistance of the glow plug 28 equals the preselected resistance (G/H) .
  • a difference produces a resistance error signal which, when fed to the glow plug, drives the glow plug's resistance to the preselected value in an attempt to keep the modified signals in equilibrium.
  • the resistance error signal is preferably pulse width modulated and varies in duty cycle in response to the magnitude of a difference between V. and V . For instance, if V. > V , the duty cycle increases, whereas if V. ⁇ V , the duty cycle decreases.
  • An output means 126 receives the resistance error signal and delivers an alternator input signal in response thereto.
  • the output means 126 preferably amplifies the resistance error signal before it is passed to the glow plug.
  • the second alternator 26 receives the amplified signal and delivers power to the glow plug in response thereto.
  • the effective voltage received by the second alternator 26 effects the power dissipated in the glow plug which consequently alters the temperature of the glow plug. As the temperature of the glow plug changes the glow plug's resistance changes accordingly as previously discussed.
  • Fig. 6 depicts a detailed embodiment of the apparatus 20.
  • a current sensing resistor 130 senses the current flowing through the glow plug 28.
  • a current mirror 132 modifies the sensed current by converting it to a voltage and delivering a modified current signal correlative to the magnitude of the sensed current signal.
  • the values of the resistors 130,134,136 in the current mirror 132 are chosen such that the sensed current signal is modified by a first coefficient.
  • the modified current signal is received by an buffering means 138 which has a high impedance input and a low impedance output, and is shown here to be a voltage follower 139.
  • the voltage sensor 118 is shown here to be a simple voltage divider 144 including a potentiometer 146 and a resistor 148.
  • the voltage divider 144 also modifies the sensed voltage by a second coefficient, and delivers a modified voltage signal correlative to the sensed voltage.
  • the values of the potentiometer 146 and the resistor 148 in the voltage divider 144 define the second coefficient.
  • the potentiometer 146 can change resistance to alter the output of the voltage divider 144.
  • the coefficients are chosen such that the quotient of first coefficient divided by second coefficient is equal to the preselected resistance of the glow plug. Moreover, the coefficients are selected such that when the modified current signal equals the modified voltage signal, the glow plug is at the preselected resistance.
  • An operational amplifier 156 receives the modified current signal from the buffering means 138 via a resistor 157 and the modified voltage signal from the voltage divider 144 via a resistor 158.
  • the operational amplifier 156 delivers a resistance error signal relative to a difference between the modified current signal and the modified voltage signal.
  • the operational amplifier 156 scales the resistance error signal so that it will always fall between an upper and lower preselected voltage.
  • a feedback resistor 159 provides a gain and stability to the operational amplifier 156.
  • the resistance error signal conforms to the following eqn. 4.
  • RES is the resistance error signal
  • Vv is the modified voltage signal
  • Vi is the modified current signal
  • Gop is the gain of the operational amplifier.
  • the resistance error signal causes the same voltage to be applied to the glow plugs as is currently being applied. If the modified current signal is greater than the modified voltage signal, RES is greater than Vv, and vice versa.
  • a means 151 modulates the resistance error signal.
  • a triangle waveform generator 154 delivers a triangle waveform ranging from the lower to the upper preselected voltages. For example, a lower preselected voltage of +4V and an upper preselected voltage of +6V.
  • the triangle waveform generator 154 can also be momentarily reset to a third preselected voltage, preferably 0V, upon the receipt of a signal from any of several circuit protection devices found throughout the circuit.
  • the voltage comparator 152 receives the triangle waveform from the triangle waveform generator 154 and the resistance error signal from the operational amplifier 156 via a resistor 160.
  • a pull up means 162 is connected to the line carrying the resistance error signal which prevents the line voltage from falling below a predetermined level.
  • the voltage comparator 152 produces a pulse width modulated (PWM) resistance error signal that has a duty cycle that varies in relation to the magnitude of the resistance error signal.
  • PWM pulse width modulated
  • An output means 164 receives the PWM resistance error signal from the voltage comparator 152.
  • the output means 164 includes two transistors 166,168 - connected in a .class B "push-pull" arrangement.
  • the "push-pull" arrangement is known in the art to be an active output stage and will not be described in detail herein.
  • the bases of the transistors 166,168 receive the PWM resistance error signal and the emitters deliver an amplified signal via resistors 169,171 to the gates of a pair of field effect transistors 170,172, which are connected in parallel.
  • the sources of the field effect transistors 170,172 are connected to ground via a resistor 173 and also to a means 174 for protecting the field effect transistors 170,172 from an overcurrent condition. If the field effect transistors* output exceeds a predetermined level, the overdrive protection means 174 sends a signal to the voltage comparator 152 which causes the output from the triangle waveform generator 154 to momentarily reset to a preselected voltage.
  • the drains of the field effect transistors 170,172 are connected to the field winding 96 of the second alternator 26 via a diode 178 and an inductor 180 wired in a parallel configuration.
  • the inductor 180 is preferably included to prevent damage to the circuit due to a sudden current surge if the circuit accidentally shorts to a high voltage source.
  • the PWM output signal received by the field winding 96 of the second alternator 26 varies the output voltage of the second alternator 26.
  • the output voltage of the second alternator 26 controls the glow plugs to the preselected resistance. As the voltage across the glow plugs increases so does the power dissipated in the glow plugs, likewise, the power dissipated in the glow plugs decreases when the voltage across the glow plugs decreases.
  • the temperature of the glow plugs change relative to the amount of power they attempt to dissipate. Finally, the resistive element in the glow plugs change resistance value due to the change in temperature.
  • protection means 150 are included to prevent the modified voltage signal from exceeding a predetermined level. Should the modified voltage signal ever reach the predetermined level, the protection means 150 sends a signal to the voltage comparator 152 which causes the output from the triangle waveform generator 154 to momentarily reset to a preselected voltage. Additionally, a means 140 produces a constant positive voltage signal for delivery to the glow plugs. The constant voltage means 140 is used when the sensed current drops below a predetermined value, ie. , the glow plug open circuits, or when a switch 142 is thrown. This protection allows the apparatus 20 to control the glow plugs even if the sensed glow plug 28 fails.
  • glow plug alternator control of this invention.
  • glow plug resistance varies linearly with glow plug temperature.
  • overheating constitutes a primary cause of glow plug - failure.
  • the glow plugs Before the engine can be started, the glow plugs must heat to a temperature sufficiently high to initiate combustion of the fuel. This temperature corresponds to the preselected resistance value. This is a value calculated to give optimum glow plug life, while providing satisfactory fuel combustion. After the glow plugs reach this preselected temperature, the engine is started.
  • the comparing means outputs a 'high' logic voltage signal. This signal is sent to the output means, which adds power to the signal.
  • the second alternator receives the high powered logic signal. The signal effects the field winding by increasing the current flowing through it, and the field winding current then increases the alternators output voltage.
  • the glow plugs are connected in parallel with each other and with the alternator output. The glow plugs receive the alternator output voltage, which increases their resistance and temperature.
  • the output means receives this signal and sends a low power logic signal to the alternator. This signal decreases the current in the field winding as well as the output voltage of the alternator.
  • the 'low' output voltage decreases glow plug resistance and glow plug temperature. The above described cycle controls the glow plug resistance and temperature within a small range about the preselected value.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

Système de commande pour dispositifs d'allumage (28, 30, 32, 34, 36, 38) utilisés dans un moteur à combustion interne (24). De manière à allumer le carburant à l'alcool dans un moteur diesel, le carburant doit être chauffé avant ou pendant la compression. Des bougies de préchauffage (28, 30, 32, 34, 36, 38) fournissent avantageusement de la chaleur mais ont une vie courte dans de telles applications continues. Les bougies de préchauffage doivent être commandées précisément pour empêcher le surchauffage qui résulterait en une interruption de circuits. Des commandes individuelles de tension constante tentent de remplir cette fonction mais n'ont qu'un succès modéré. Elles sont coûteuses et complexes et ne protègent que modérément contre la surchauffe. Etant donné qu'il y a une correlation entre la résistance de la bougie de préchauffage et la température de la bougie de préchauffage, une commande de résistance constitue une meilleure protection contre la surchauffe de la bougie de préchauffage. Par conséquent, un appareil (20) contrôle la résistance d'une bougie de préchauffage (28) et commande la résistance de chaque bougie de préchauffage pour que cette résistance soit maintenue à une valeur présélectionnée. Cette valeur de résistance présélectionnée représente une température de la bougie de préchauffage qui correspond à une bonne combustion du carburant et à une vie prolongée de la bougie de préchauffage. L'utilisation principale de l'appareil (20) de la présente invention concerne les moteurs à combustion interne utilisant différents carburants.
PCT/US1987/002878 1986-11-28 1987-11-04 Commande d'alternateur pour bougie de prechauffage Ceased WO1988003991A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
BR8707552A BR8707552A (pt) 1986-11-28 1987-11-04 Aparelho para controlar a resistencia de vela de incandescencia

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US935,897 1986-11-28
US06/935,897 US4726333A (en) 1986-11-28 1986-11-28 Glow plug alternator control

Publications (1)

Publication Number Publication Date
WO1988003991A1 true WO1988003991A1 (fr) 1988-06-02

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Application Number Title Priority Date Filing Date
PCT/US1987/002878 Ceased WO1988003991A1 (fr) 1986-11-28 1987-11-04 Commande d'alternateur pour bougie de prechauffage

Country Status (6)

Country Link
US (1) US4726333A (fr)
JP (1) JP2694552B2 (fr)
BR (1) BR8707552A (fr)
CA (1) CA1284195C (fr)
WO (1) WO1988003991A1 (fr)
ZA (1) ZA878890B (fr)

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CN100516507C (zh) * 2002-05-14 2009-07-22 日本特殊陶业株式会社 电热塞控制部件和电热塞
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Also Published As

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JPH01501498A (ja) 1989-05-25
BR8707552A (pt) 1989-03-14
CA1284195C (fr) 1991-05-14
JP2694552B2 (ja) 1997-12-24
ZA878890B (en) 1988-12-28
US4726333A (en) 1988-02-23

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